Measuring and testing – Borehole or drilling – Downhole test
Patent
1983-01-13
1984-07-24
Birmiel, Howard A.
Measuring and testing
Borehole or drilling
Downhole test
73783, 73784, E21B 4900
Patent
active
044611714
ABSTRACT:
Measurements of the deformability of deep rock masses are made by positioning a borehole jack (20) having opposed bearing plates (22, 24) in a borehole at a position at which measurements are to be made, and driving the pressure plates (22, 24) apart to displace the walls of the borehole. A lateral displacement probe (30) is mounted between the pressure plate surfaces in position to detect and measure displacements of the wall of the borehole at points lying on a diameter perpendicular to the direction of the resultant of the equal and opposite forces applied by the pressure plates (22, 24) to the wall (21) of the borehole. The lateral displacement probe (30) includes probe tips (35) that are biased firmly against the wall (21) of the borehole to move inwardly or outwardly therewith. A displacement transducer provides an output signal transmitted to the surface which is indicative of the displacements of the probe tips (35). The measurement of displacement at positions perpendicular to the resultant of the forces applied to the borehole by the pressure plates are more reliably related to the deformability characteristics of the rock mass than measurement of the displacements of the rock mass directly under the pressure plates.
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R. V. de la Cruz, Modified Borehole Jack Method for Elastic Property Determination in Rocks, Rock Mechanics 10, pp. 221-239 (1978).
Birmiel Howard A.
Wisconsin Alumni Research Foundation
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